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Commit | Line | Data |
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3af9a77a TH |
1 | /* |
2 | * libata-pmp.c - libata port multiplier support | |
3 | * | |
4 | * Copyright (c) 2007 SUSE Linux Products GmbH | |
5 | * Copyright (c) 2007 Tejun Heo <teheo@suse.de> | |
6 | * | |
7 | * This file is released under the GPLv2. | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/libata.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
3af9a77a TH |
13 | #include "libata.h" |
14 | ||
48515f6c TH |
15 | const struct ata_port_operations sata_pmp_port_ops = { |
16 | .inherits = &sata_port_ops, | |
17 | .pmp_prereset = ata_std_prereset, | |
18 | .pmp_hardreset = sata_std_hardreset, | |
19 | .pmp_postreset = ata_std_postreset, | |
20 | .error_handler = sata_pmp_error_handler, | |
21 | }; | |
22 | ||
3af9a77a TH |
23 | /** |
24 | * sata_pmp_read - read PMP register | |
25 | * @link: link to read PMP register for | |
26 | * @reg: register to read | |
27 | * @r_val: resulting value | |
28 | * | |
b06ce3e5 | 29 | * Read PMP register. |
3af9a77a TH |
30 | * |
31 | * LOCKING: | |
32 | * Kernel thread context (may sleep). | |
33 | * | |
34 | * RETURNS: | |
b06ce3e5 | 35 | * 0 on success, AC_ERR_* mask on failure. |
3af9a77a | 36 | */ |
b06ce3e5 | 37 | static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) |
3af9a77a TH |
38 | { |
39 | struct ata_port *ap = link->ap; | |
40 | struct ata_device *pmp_dev = ap->link.device; | |
b06ce3e5 TH |
41 | struct ata_taskfile tf; |
42 | unsigned int err_mask; | |
43 | ||
44 | ata_tf_init(pmp_dev, &tf); | |
45 | tf.command = ATA_CMD_PMP_READ; | |
46 | tf.protocol = ATA_PROT_NODATA; | |
39f25e70 | 47 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; |
b06ce3e5 TH |
48 | tf.feature = reg; |
49 | tf.device = link->pmp; | |
50 | ||
51 | err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, | |
bf1bff6f | 52 | SATA_PMP_RW_TIMEOUT); |
b06ce3e5 TH |
53 | if (err_mask) |
54 | return err_mask; | |
55 | ||
56 | *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; | |
57 | return 0; | |
3af9a77a TH |
58 | } |
59 | ||
60 | /** | |
61 | * sata_pmp_write - write PMP register | |
62 | * @link: link to write PMP register for | |
63 | * @reg: register to write | |
64 | * @r_val: value to write | |
65 | * | |
b06ce3e5 | 66 | * Write PMP register. |
3af9a77a TH |
67 | * |
68 | * LOCKING: | |
69 | * Kernel thread context (may sleep). | |
70 | * | |
71 | * RETURNS: | |
b06ce3e5 | 72 | * 0 on success, AC_ERR_* mask on failure. |
3af9a77a | 73 | */ |
b06ce3e5 | 74 | static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) |
3af9a77a TH |
75 | { |
76 | struct ata_port *ap = link->ap; | |
77 | struct ata_device *pmp_dev = ap->link.device; | |
b06ce3e5 TH |
78 | struct ata_taskfile tf; |
79 | ||
80 | ata_tf_init(pmp_dev, &tf); | |
81 | tf.command = ATA_CMD_PMP_WRITE; | |
82 | tf.protocol = ATA_PROT_NODATA; | |
39f25e70 | 83 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; |
b06ce3e5 TH |
84 | tf.feature = reg; |
85 | tf.device = link->pmp; | |
86 | tf.nsect = val & 0xff; | |
87 | tf.lbal = (val >> 8) & 0xff; | |
88 | tf.lbam = (val >> 16) & 0xff; | |
89 | tf.lbah = (val >> 24) & 0xff; | |
90 | ||
91 | return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, | |
bf1bff6f | 92 | SATA_PMP_RW_TIMEOUT); |
3af9a77a TH |
93 | } |
94 | ||
31f88384 TH |
95 | /** |
96 | * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP | |
97 | * @qc: ATA command in question | |
98 | * | |
99 | * A host which has command switching PMP support cannot issue | |
100 | * commands to multiple links simultaneously. | |
101 | * | |
102 | * LOCKING: | |
103 | * spin_lock_irqsave(host lock) | |
104 | * | |
105 | * RETURNS: | |
106 | * ATA_DEFER_* if deferring is needed, 0 otherwise. | |
107 | */ | |
108 | int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) | |
109 | { | |
110 | struct ata_link *link = qc->dev->link; | |
111 | struct ata_port *ap = link->ap; | |
112 | ||
113 | if (ap->excl_link == NULL || ap->excl_link == link) { | |
114 | if (ap->nr_active_links == 0 || ata_link_active(link)) { | |
115 | qc->flags |= ATA_QCFLAG_CLEAR_EXCL; | |
116 | return ata_std_qc_defer(qc); | |
117 | } | |
118 | ||
119 | ap->excl_link = link; | |
120 | } | |
121 | ||
122 | return ATA_DEFER_PORT; | |
123 | } | |
124 | ||
3af9a77a TH |
125 | /** |
126 | * sata_pmp_scr_read - read PSCR | |
127 | * @link: ATA link to read PSCR for | |
128 | * @reg: PSCR to read | |
129 | * @r_val: resulting value | |
130 | * | |
131 | * Read PSCR @reg into @r_val for @link, to be called from | |
132 | * ata_scr_read(). | |
133 | * | |
134 | * LOCKING: | |
135 | * Kernel thread context (may sleep). | |
136 | * | |
137 | * RETURNS: | |
138 | * 0 on success, -errno on failure. | |
139 | */ | |
140 | int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) | |
141 | { | |
b06ce3e5 TH |
142 | unsigned int err_mask; |
143 | ||
3af9a77a TH |
144 | if (reg > SATA_PMP_PSCR_CONTROL) |
145 | return -EINVAL; | |
146 | ||
b06ce3e5 TH |
147 | err_mask = sata_pmp_read(link, reg, r_val); |
148 | if (err_mask) { | |
149 | ata_link_printk(link, KERN_WARNING, "failed to read SCR %d " | |
150 | "(Emask=0x%x)\n", reg, err_mask); | |
151 | return -EIO; | |
152 | } | |
153 | return 0; | |
3af9a77a TH |
154 | } |
155 | ||
156 | /** | |
157 | * sata_pmp_scr_write - write PSCR | |
158 | * @link: ATA link to write PSCR for | |
159 | * @reg: PSCR to write | |
160 | * @val: value to be written | |
161 | * | |
162 | * Write @val to PSCR @reg for @link, to be called from | |
163 | * ata_scr_write() and ata_scr_write_flush(). | |
164 | * | |
165 | * LOCKING: | |
166 | * Kernel thread context (may sleep). | |
167 | * | |
168 | * RETURNS: | |
169 | * 0 on success, -errno on failure. | |
170 | */ | |
171 | int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) | |
172 | { | |
b06ce3e5 TH |
173 | unsigned int err_mask; |
174 | ||
3af9a77a TH |
175 | if (reg > SATA_PMP_PSCR_CONTROL) |
176 | return -EINVAL; | |
177 | ||
b06ce3e5 TH |
178 | err_mask = sata_pmp_write(link, reg, val); |
179 | if (err_mask) { | |
180 | ata_link_printk(link, KERN_WARNING, "failed to write SCR %d " | |
181 | "(Emask=0x%x)\n", reg, err_mask); | |
182 | return -EIO; | |
183 | } | |
184 | return 0; | |
3af9a77a TH |
185 | } |
186 | ||
3af9a77a TH |
187 | /** |
188 | * sata_pmp_read_gscr - read GSCR block of SATA PMP | |
189 | * @dev: PMP device | |
190 | * @gscr: buffer to read GSCR block into | |
191 | * | |
192 | * Read selected PMP GSCRs from the PMP at @dev. This will serve | |
193 | * as configuration and identification info for the PMP. | |
194 | * | |
195 | * LOCKING: | |
196 | * Kernel thread context (may sleep). | |
197 | * | |
198 | * RETURNS: | |
199 | * 0 on success, -errno on failure. | |
200 | */ | |
201 | static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) | |
202 | { | |
203 | static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; | |
b06ce3e5 | 204 | int i; |
3af9a77a TH |
205 | |
206 | for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { | |
207 | int reg = gscr_to_read[i]; | |
b06ce3e5 | 208 | unsigned int err_mask; |
3af9a77a | 209 | |
b06ce3e5 TH |
210 | err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); |
211 | if (err_mask) { | |
212 | ata_dev_printk(dev, KERN_ERR, "failed to read PMP " | |
213 | "GSCR[%d] (Emask=0x%x)\n", reg, err_mask); | |
214 | return -EIO; | |
3af9a77a TH |
215 | } |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static const char *sata_pmp_spec_rev_str(const u32 *gscr) | |
222 | { | |
223 | u32 rev = gscr[SATA_PMP_GSCR_REV]; | |
224 | ||
deeb003e SH |
225 | if (rev & (1 << 3)) |
226 | return "1.2"; | |
3af9a77a TH |
227 | if (rev & (1 << 2)) |
228 | return "1.1"; | |
229 | if (rev & (1 << 1)) | |
230 | return "1.0"; | |
231 | return "<unknown>"; | |
232 | } | |
233 | ||
4f2c7748 GG |
234 | #define PMP_GSCR_SII_POL 129 |
235 | ||
3af9a77a TH |
236 | static int sata_pmp_configure(struct ata_device *dev, int print_info) |
237 | { | |
238 | struct ata_port *ap = dev->link->ap; | |
239 | u32 *gscr = dev->gscr; | |
4f2c7748 GG |
240 | u16 vendor = sata_pmp_gscr_vendor(gscr); |
241 | u16 devid = sata_pmp_gscr_devid(gscr); | |
b06ce3e5 | 242 | unsigned int err_mask = 0; |
3af9a77a TH |
243 | const char *reason; |
244 | int nr_ports, rc; | |
245 | ||
246 | nr_ports = sata_pmp_gscr_ports(gscr); | |
247 | ||
248 | if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { | |
249 | rc = -EINVAL; | |
250 | reason = "invalid nr_ports"; | |
251 | goto fail; | |
252 | } | |
253 | ||
254 | if ((ap->flags & ATA_FLAG_AN) && | |
255 | (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) | |
256 | dev->flags |= ATA_DFLAG_AN; | |
257 | ||
258 | /* monitor SERR_PHYRDY_CHG on fan-out ports */ | |
b06ce3e5 TH |
259 | err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, |
260 | SERR_PHYRDY_CHG); | |
261 | if (err_mask) { | |
262 | rc = -EIO; | |
3af9a77a TH |
263 | reason = "failed to write GSCR_ERROR_EN"; |
264 | goto fail; | |
265 | } | |
266 | ||
4f2c7748 GG |
267 | /* Disable sending Early R_OK. |
268 | * With "cached read" HDD testing and multiple ports busy on a SATA | |
269 | * host controller, 3726 PMP will very rarely drop a deferred | |
270 | * R_OK that was intended for the host. Symptom will be all | |
271 | * 5 drives under test will timeout, get reset, and recover. | |
272 | */ | |
273 | if (vendor == 0x1095 && devid == 0x3726) { | |
274 | u32 reg; | |
275 | ||
276 | err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®); | |
277 | if (err_mask) { | |
278 | rc = -EIO; | |
279 | reason = "failed to read Sil3726 Private Register"; | |
280 | goto fail; | |
281 | } | |
282 | reg &= ~0x1; | |
283 | err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg); | |
284 | if (err_mask) { | |
285 | rc = -EIO; | |
286 | reason = "failed to write Sil3726 Private Register"; | |
287 | goto fail; | |
288 | } | |
289 | } | |
290 | ||
3af9a77a TH |
291 | if (print_info) { |
292 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " | |
293 | "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", | |
4f2c7748 | 294 | sata_pmp_spec_rev_str(gscr), vendor, devid, |
3af9a77a TH |
295 | sata_pmp_gscr_rev(gscr), |
296 | nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], | |
297 | gscr[SATA_PMP_GSCR_FEAT]); | |
298 | ||
299 | if (!(dev->flags & ATA_DFLAG_AN)) | |
300 | ata_dev_printk(dev, KERN_INFO, | |
301 | "Asynchronous notification not supported, " | |
302 | "hotplug won't\n work on fan-out " | |
303 | "ports. Use warm-plug instead.\n"); | |
304 | } | |
305 | ||
306 | return 0; | |
307 | ||
308 | fail: | |
309 | ata_dev_printk(dev, KERN_ERR, | |
b06ce3e5 TH |
310 | "failed to configure Port Multiplier (%s, Emask=0x%x)\n", |
311 | reason, err_mask); | |
3af9a77a TH |
312 | return rc; |
313 | } | |
314 | ||
315 | static int sata_pmp_init_links(struct ata_port *ap, int nr_ports) | |
316 | { | |
317 | struct ata_link *pmp_link = ap->pmp_link; | |
318 | int i; | |
319 | ||
320 | if (!pmp_link) { | |
321 | pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, | |
322 | GFP_NOIO); | |
323 | if (!pmp_link) | |
324 | return -ENOMEM; | |
325 | ||
326 | for (i = 0; i < SATA_PMP_MAX_PORTS; i++) | |
327 | ata_link_init(ap, &pmp_link[i], i); | |
328 | ||
329 | ap->pmp_link = pmp_link; | |
330 | } | |
331 | ||
332 | for (i = 0; i < nr_ports; i++) { | |
333 | struct ata_link *link = &pmp_link[i]; | |
334 | struct ata_eh_context *ehc = &link->eh_context; | |
335 | ||
336 | link->flags = 0; | |
b558eddd | 337 | ehc->i.probe_mask |= ATA_ALL_DEVICES; |
cf480626 | 338 | ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
339 | } |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | static void sata_pmp_quirks(struct ata_port *ap) | |
345 | { | |
346 | u32 *gscr = ap->link.device->gscr; | |
347 | u16 vendor = sata_pmp_gscr_vendor(gscr); | |
348 | u16 devid = sata_pmp_gscr_devid(gscr); | |
349 | struct ata_link *link; | |
350 | ||
351 | if (vendor == 0x1095 && devid == 0x3726) { | |
352 | /* sil3726 quirks */ | |
1eca4365 | 353 | ata_for_each_link(link, ap, EDGE) { |
19ef9d5e TH |
354 | /* Class code report is unreliable and SRST |
355 | * times out under certain configurations. | |
356 | */ | |
3af9a77a | 357 | if (link->pmp < 5) |
19ef9d5e TH |
358 | link->flags |= ATA_LFLAG_NO_SRST | |
359 | ATA_LFLAG_ASSUME_ATA; | |
3af9a77a TH |
360 | |
361 | /* port 5 is for SEMB device and it doesn't like SRST */ | |
362 | if (link->pmp == 5) | |
363 | link->flags |= ATA_LFLAG_NO_SRST | | |
364 | ATA_LFLAG_ASSUME_SEMB; | |
365 | } | |
366 | } else if (vendor == 0x1095 && devid == 0x4723) { | |
367 | /* sil4723 quirks */ | |
1eca4365 | 368 | ata_for_each_link(link, ap, EDGE) { |
3af9a77a TH |
369 | /* class code report is unreliable */ |
370 | if (link->pmp < 2) | |
371 | link->flags |= ATA_LFLAG_ASSUME_ATA; | |
372 | ||
373 | /* the config device at port 2 locks up on SRST */ | |
374 | if (link->pmp == 2) | |
375 | link->flags |= ATA_LFLAG_NO_SRST | | |
376 | ATA_LFLAG_ASSUME_ATA; | |
377 | } | |
378 | } else if (vendor == 0x1095 && devid == 0x4726) { | |
379 | /* sil4726 quirks */ | |
1eca4365 | 380 | ata_for_each_link(link, ap, EDGE) { |
8048307d TH |
381 | /* Class code report is unreliable and SRST |
382 | * times out under certain configurations. | |
383 | * Config device can be at port 0 or 5 and | |
384 | * locks up on SRST. | |
3af9a77a | 385 | */ |
8048307d | 386 | if (link->pmp <= 5) |
3af9a77a TH |
387 | link->flags |= ATA_LFLAG_NO_SRST | |
388 | ATA_LFLAG_ASSUME_ATA; | |
389 | ||
390 | /* Port 6 is for SEMB device which doesn't | |
391 | * like SRST either. | |
392 | */ | |
393 | if (link->pmp == 6) | |
394 | link->flags |= ATA_LFLAG_NO_SRST | | |
395 | ATA_LFLAG_ASSUME_SEMB; | |
396 | } | |
397 | } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || | |
398 | devid == 0x5734 || devid == 0x5744)) { | |
399 | /* sil5723/5744 quirks */ | |
400 | ||
401 | /* sil5723/5744 has either two or three downstream | |
402 | * ports depending on operation mode. The last port | |
403 | * is empty if any actual IO device is available or | |
404 | * occupied by a pseudo configuration device | |
405 | * otherwise. Don't try hard to recover it. | |
406 | */ | |
407 | ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; | |
3af9a77a TH |
408 | } |
409 | } | |
410 | ||
411 | /** | |
412 | * sata_pmp_attach - attach a SATA PMP device | |
413 | * @dev: SATA PMP device to attach | |
414 | * | |
415 | * Configure and attach SATA PMP device @dev. This function is | |
416 | * also responsible for allocating and initializing PMP links. | |
417 | * | |
418 | * LOCKING: | |
419 | * Kernel thread context (may sleep). | |
420 | * | |
421 | * RETURNS: | |
422 | * 0 on success, -errno on failure. | |
423 | */ | |
424 | int sata_pmp_attach(struct ata_device *dev) | |
425 | { | |
426 | struct ata_link *link = dev->link; | |
427 | struct ata_port *ap = link->ap; | |
428 | unsigned long flags; | |
429 | struct ata_link *tlink; | |
430 | int rc; | |
431 | ||
432 | /* is it hanging off the right place? */ | |
071f44b1 | 433 | if (!sata_pmp_supported(ap)) { |
3af9a77a TH |
434 | ata_dev_printk(dev, KERN_ERR, |
435 | "host does not support Port Multiplier\n"); | |
436 | return -EINVAL; | |
437 | } | |
438 | ||
439 | if (!ata_is_host_link(link)) { | |
440 | ata_dev_printk(dev, KERN_ERR, | |
441 | "Port Multipliers cannot be nested\n"); | |
442 | return -EINVAL; | |
443 | } | |
444 | ||
445 | if (dev->devno) { | |
446 | ata_dev_printk(dev, KERN_ERR, | |
447 | "Port Multiplier must be the first device\n"); | |
448 | return -EINVAL; | |
449 | } | |
450 | ||
451 | WARN_ON(link->pmp != 0); | |
452 | link->pmp = SATA_PMP_CTRL_PORT; | |
453 | ||
454 | /* read GSCR block */ | |
455 | rc = sata_pmp_read_gscr(dev, dev->gscr); | |
456 | if (rc) | |
457 | goto fail; | |
458 | ||
459 | /* config PMP */ | |
460 | rc = sata_pmp_configure(dev, 1); | |
461 | if (rc) | |
462 | goto fail; | |
463 | ||
464 | rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); | |
465 | if (rc) { | |
466 | ata_dev_printk(dev, KERN_INFO, | |
467 | "failed to initialize PMP links\n"); | |
468 | goto fail; | |
469 | } | |
470 | ||
471 | /* attach it */ | |
472 | spin_lock_irqsave(ap->lock, flags); | |
473 | WARN_ON(ap->nr_pmp_links); | |
474 | ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); | |
475 | spin_unlock_irqrestore(ap->lock, flags); | |
476 | ||
477 | sata_pmp_quirks(ap); | |
478 | ||
479 | if (ap->ops->pmp_attach) | |
480 | ap->ops->pmp_attach(ap); | |
481 | ||
1eca4365 | 482 | ata_for_each_link(tlink, ap, EDGE) |
3af9a77a TH |
483 | sata_link_init_spd(tlink); |
484 | ||
d0df8b5d TH |
485 | ata_acpi_associate_sata_port(ap); |
486 | ||
3af9a77a TH |
487 | return 0; |
488 | ||
489 | fail: | |
490 | link->pmp = 0; | |
491 | return rc; | |
492 | } | |
493 | ||
494 | /** | |
495 | * sata_pmp_detach - detach a SATA PMP device | |
496 | * @dev: SATA PMP device to detach | |
497 | * | |
498 | * Detach SATA PMP device @dev. This function is also | |
499 | * responsible for deconfiguring PMP links. | |
500 | * | |
501 | * LOCKING: | |
502 | * Kernel thread context (may sleep). | |
503 | */ | |
504 | static void sata_pmp_detach(struct ata_device *dev) | |
505 | { | |
506 | struct ata_link *link = dev->link; | |
507 | struct ata_port *ap = link->ap; | |
508 | struct ata_link *tlink; | |
509 | unsigned long flags; | |
510 | ||
511 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); | |
512 | ||
513 | WARN_ON(!ata_is_host_link(link) || dev->devno || | |
514 | link->pmp != SATA_PMP_CTRL_PORT); | |
515 | ||
516 | if (ap->ops->pmp_detach) | |
517 | ap->ops->pmp_detach(ap); | |
518 | ||
1eca4365 | 519 | ata_for_each_link(tlink, ap, EDGE) |
3af9a77a TH |
520 | ata_eh_detach_dev(tlink->device); |
521 | ||
522 | spin_lock_irqsave(ap->lock, flags); | |
523 | ap->nr_pmp_links = 0; | |
524 | link->pmp = 0; | |
525 | spin_unlock_irqrestore(ap->lock, flags); | |
d0df8b5d TH |
526 | |
527 | ata_acpi_associate_sata_port(ap); | |
3af9a77a TH |
528 | } |
529 | ||
530 | /** | |
531 | * sata_pmp_same_pmp - does new GSCR matches the configured PMP? | |
532 | * @dev: PMP device to compare against | |
533 | * @new_gscr: GSCR block of the new device | |
534 | * | |
535 | * Compare @new_gscr against @dev and determine whether @dev is | |
536 | * the PMP described by @new_gscr. | |
537 | * | |
538 | * LOCKING: | |
539 | * None. | |
540 | * | |
541 | * RETURNS: | |
542 | * 1 if @dev matches @new_gscr, 0 otherwise. | |
543 | */ | |
544 | static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) | |
545 | { | |
546 | const u32 *old_gscr = dev->gscr; | |
547 | u16 old_vendor, new_vendor, old_devid, new_devid; | |
548 | int old_nr_ports, new_nr_ports; | |
549 | ||
550 | old_vendor = sata_pmp_gscr_vendor(old_gscr); | |
551 | new_vendor = sata_pmp_gscr_vendor(new_gscr); | |
552 | old_devid = sata_pmp_gscr_devid(old_gscr); | |
553 | new_devid = sata_pmp_gscr_devid(new_gscr); | |
554 | old_nr_ports = sata_pmp_gscr_ports(old_gscr); | |
555 | new_nr_ports = sata_pmp_gscr_ports(new_gscr); | |
556 | ||
557 | if (old_vendor != new_vendor) { | |
558 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
559 | "vendor mismatch '0x%x' != '0x%x'\n", | |
560 | old_vendor, new_vendor); | |
561 | return 0; | |
562 | } | |
563 | ||
564 | if (old_devid != new_devid) { | |
565 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
566 | "device ID mismatch '0x%x' != '0x%x'\n", | |
567 | old_devid, new_devid); | |
568 | return 0; | |
569 | } | |
570 | ||
571 | if (old_nr_ports != new_nr_ports) { | |
572 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
573 | "nr_ports mismatch '0x%x' != '0x%x'\n", | |
574 | old_nr_ports, new_nr_ports); | |
575 | return 0; | |
576 | } | |
577 | ||
578 | return 1; | |
579 | } | |
580 | ||
581 | /** | |
582 | * sata_pmp_revalidate - revalidate SATA PMP | |
583 | * @dev: PMP device to revalidate | |
584 | * @new_class: new class code | |
585 | * | |
586 | * Re-read GSCR block and make sure @dev is still attached to the | |
587 | * port and properly configured. | |
588 | * | |
589 | * LOCKING: | |
590 | * Kernel thread context (may sleep). | |
591 | * | |
592 | * RETURNS: | |
593 | * 0 on success, -errno otherwise. | |
594 | */ | |
595 | static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) | |
596 | { | |
597 | struct ata_link *link = dev->link; | |
598 | struct ata_port *ap = link->ap; | |
599 | u32 *gscr = (void *)ap->sector_buf; | |
600 | int rc; | |
601 | ||
602 | DPRINTK("ENTER\n"); | |
603 | ||
604 | ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); | |
605 | ||
606 | if (!ata_dev_enabled(dev)) { | |
607 | rc = -ENODEV; | |
608 | goto fail; | |
609 | } | |
610 | ||
611 | /* wrong class? */ | |
612 | if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { | |
613 | rc = -ENODEV; | |
614 | goto fail; | |
615 | } | |
616 | ||
617 | /* read GSCR */ | |
618 | rc = sata_pmp_read_gscr(dev, gscr); | |
619 | if (rc) | |
620 | goto fail; | |
621 | ||
622 | /* is the pmp still there? */ | |
623 | if (!sata_pmp_same_pmp(dev, gscr)) { | |
624 | rc = -ENODEV; | |
625 | goto fail; | |
626 | } | |
627 | ||
628 | memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); | |
629 | ||
630 | rc = sata_pmp_configure(dev, 0); | |
631 | if (rc) | |
632 | goto fail; | |
633 | ||
634 | ata_eh_done(link, NULL, ATA_EH_REVALIDATE); | |
635 | ||
636 | DPRINTK("EXIT, rc=0\n"); | |
637 | return 0; | |
638 | ||
639 | fail: | |
640 | ata_dev_printk(dev, KERN_ERR, | |
641 | "PMP revalidation failed (errno=%d)\n", rc); | |
642 | DPRINTK("EXIT, rc=%d\n", rc); | |
643 | return rc; | |
644 | } | |
645 | ||
646 | /** | |
647 | * sata_pmp_revalidate_quick - revalidate SATA PMP quickly | |
648 | * @dev: PMP device to revalidate | |
649 | * | |
650 | * Make sure the attached PMP is accessible. | |
651 | * | |
652 | * LOCKING: | |
653 | * Kernel thread context (may sleep). | |
654 | * | |
655 | * RETURNS: | |
656 | * 0 on success, -errno otherwise. | |
657 | */ | |
658 | static int sata_pmp_revalidate_quick(struct ata_device *dev) | |
659 | { | |
b06ce3e5 | 660 | unsigned int err_mask; |
3af9a77a | 661 | u32 prod_id; |
3af9a77a | 662 | |
b06ce3e5 TH |
663 | err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); |
664 | if (err_mask) { | |
665 | ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " | |
666 | "(Emask=0x%x)\n", err_mask); | |
667 | return -EIO; | |
3af9a77a TH |
668 | } |
669 | ||
670 | if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { | |
671 | ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); | |
672 | /* something weird is going on, request full PMP recovery */ | |
673 | return -EIO; | |
674 | } | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | /** | |
680 | * sata_pmp_eh_recover_pmp - recover PMP | |
681 | * @ap: ATA port PMP is attached to | |
682 | * @prereset: prereset method (can be NULL) | |
683 | * @softreset: softreset method | |
684 | * @hardreset: hardreset method | |
685 | * @postreset: postreset method (can be NULL) | |
686 | * | |
687 | * Recover PMP attached to @ap. Recovery procedure is somewhat | |
688 | * similar to that of ata_eh_recover() except that reset should | |
689 | * always be performed in hard->soft sequence and recovery | |
690 | * failure results in PMP detachment. | |
691 | * | |
692 | * LOCKING: | |
693 | * Kernel thread context (may sleep). | |
694 | * | |
695 | * RETURNS: | |
696 | * 0 on success, -errno on failure. | |
697 | */ | |
698 | static int sata_pmp_eh_recover_pmp(struct ata_port *ap, | |
699 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
700 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) | |
701 | { | |
702 | struct ata_link *link = &ap->link; | |
703 | struct ata_eh_context *ehc = &link->eh_context; | |
704 | struct ata_device *dev = link->device; | |
705 | int tries = ATA_EH_PMP_TRIES; | |
706 | int detach = 0, rc = 0; | |
707 | int reval_failed = 0; | |
708 | ||
709 | DPRINTK("ENTER\n"); | |
710 | ||
711 | if (dev->flags & ATA_DFLAG_DETACH) { | |
712 | detach = 1; | |
713 | goto fail; | |
714 | } | |
715 | ||
716 | retry: | |
717 | ehc->classes[0] = ATA_DEV_UNKNOWN; | |
718 | ||
cf480626 | 719 | if (ehc->i.action & ATA_EH_RESET) { |
3af9a77a TH |
720 | struct ata_link *tlink; |
721 | ||
3af9a77a | 722 | /* reset */ |
3af9a77a TH |
723 | rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, |
724 | postreset); | |
725 | if (rc) { | |
726 | ata_link_printk(link, KERN_ERR, | |
727 | "failed to reset PMP, giving up\n"); | |
728 | goto fail; | |
729 | } | |
730 | ||
3af9a77a | 731 | /* PMP is reset, SErrors cannot be trusted, scan all */ |
1eca4365 | 732 | ata_for_each_link(tlink, ap, EDGE) { |
b558eddd TH |
733 | struct ata_eh_context *ehc = &tlink->eh_context; |
734 | ||
735 | ehc->i.probe_mask |= ATA_ALL_DEVICES; | |
736 | ehc->i.action |= ATA_EH_RESET; | |
737 | } | |
3af9a77a TH |
738 | } |
739 | ||
740 | /* If revalidation is requested, revalidate and reconfigure; | |
741 | * otherwise, do quick revalidation. | |
742 | */ | |
743 | if (ehc->i.action & ATA_EH_REVALIDATE) | |
744 | rc = sata_pmp_revalidate(dev, ehc->classes[0]); | |
745 | else | |
746 | rc = sata_pmp_revalidate_quick(dev); | |
747 | ||
748 | if (rc) { | |
749 | tries--; | |
750 | ||
751 | if (rc == -ENODEV) { | |
b558eddd | 752 | ehc->i.probe_mask |= ATA_ALL_DEVICES; |
3af9a77a TH |
753 | detach = 1; |
754 | /* give it just two more chances */ | |
755 | tries = min(tries, 2); | |
756 | } | |
757 | ||
758 | if (tries) { | |
3af9a77a TH |
759 | /* consecutive revalidation failures? speed down */ |
760 | if (reval_failed) | |
a07d499b | 761 | sata_down_spd_limit(link, 0); |
3af9a77a TH |
762 | else |
763 | reval_failed = 1; | |
764 | ||
cf480626 | 765 | ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
766 | goto retry; |
767 | } else { | |
768 | ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " | |
769 | "after %d tries, giving up\n", | |
770 | ATA_EH_PMP_TRIES); | |
771 | goto fail; | |
772 | } | |
773 | } | |
774 | ||
775 | /* okay, PMP resurrected */ | |
776 | ehc->i.flags = 0; | |
777 | ||
778 | DPRINTK("EXIT, rc=0\n"); | |
779 | return 0; | |
780 | ||
781 | fail: | |
782 | sata_pmp_detach(dev); | |
783 | if (detach) | |
784 | ata_eh_detach_dev(dev); | |
785 | else | |
786 | ata_dev_disable(dev); | |
787 | ||
788 | DPRINTK("EXIT, rc=%d\n", rc); | |
789 | return rc; | |
790 | } | |
791 | ||
792 | static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) | |
793 | { | |
794 | struct ata_link *link; | |
795 | unsigned long flags; | |
796 | int rc; | |
797 | ||
798 | spin_lock_irqsave(ap->lock, flags); | |
799 | ||
1eca4365 | 800 | ata_for_each_link(link, ap, EDGE) { |
3af9a77a TH |
801 | if (!(link->flags & ATA_LFLAG_DISABLED)) |
802 | continue; | |
803 | ||
804 | spin_unlock_irqrestore(ap->lock, flags); | |
805 | ||
806 | /* Some PMPs require hardreset sequence to get | |
807 | * SError.N working. | |
808 | */ | |
cf480626 | 809 | sata_link_hardreset(link, sata_deb_timing_normal, |
341c2c95 TH |
810 | ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), |
811 | NULL, NULL); | |
3af9a77a TH |
812 | |
813 | /* unconditionally clear SError.N */ | |
814 | rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); | |
815 | if (rc) { | |
816 | ata_link_printk(link, KERN_ERR, "failed to clear " | |
817 | "SError.N (errno=%d)\n", rc); | |
818 | return rc; | |
819 | } | |
820 | ||
821 | spin_lock_irqsave(ap->lock, flags); | |
822 | } | |
823 | ||
824 | spin_unlock_irqrestore(ap->lock, flags); | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) | |
830 | { | |
831 | struct ata_port *ap = link->ap; | |
832 | unsigned long flags; | |
833 | ||
834 | if (link_tries[link->pmp] && --link_tries[link->pmp]) | |
835 | return 1; | |
836 | ||
837 | /* disable this link */ | |
838 | if (!(link->flags & ATA_LFLAG_DISABLED)) { | |
839 | ata_link_printk(link, KERN_WARNING, | |
840 | "failed to recover link after %d tries, disabling\n", | |
841 | ATA_EH_PMP_LINK_TRIES); | |
842 | ||
843 | spin_lock_irqsave(ap->lock, flags); | |
844 | link->flags |= ATA_LFLAG_DISABLED; | |
845 | spin_unlock_irqrestore(ap->lock, flags); | |
846 | } | |
847 | ||
848 | ata_dev_disable(link->device); | |
849 | link->eh_context.i.action = 0; | |
850 | ||
851 | return 0; | |
852 | } | |
853 | ||
854 | /** | |
855 | * sata_pmp_eh_recover - recover PMP-enabled port | |
856 | * @ap: ATA port to recover | |
3af9a77a TH |
857 | * |
858 | * Drive EH recovery operation for PMP enabled port @ap. This | |
859 | * function recovers host and PMP ports with proper retrials and | |
860 | * fallbacks. Actual recovery operations are performed using | |
861 | * ata_eh_recover() and sata_pmp_eh_recover_pmp(). | |
862 | * | |
863 | * LOCKING: | |
864 | * Kernel thread context (may sleep). | |
865 | * | |
866 | * RETURNS: | |
867 | * 0 on success, -errno on failure. | |
868 | */ | |
a1efdaba | 869 | static int sata_pmp_eh_recover(struct ata_port *ap) |
3af9a77a | 870 | { |
a1efdaba | 871 | struct ata_port_operations *ops = ap->ops; |
3af9a77a TH |
872 | int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; |
873 | struct ata_link *pmp_link = &ap->link; | |
874 | struct ata_device *pmp_dev = pmp_link->device; | |
875 | struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; | |
f1bbfb90 | 876 | u32 *gscr = pmp_dev->gscr; |
3af9a77a TH |
877 | struct ata_link *link; |
878 | struct ata_device *dev; | |
b06ce3e5 | 879 | unsigned int err_mask; |
3af9a77a TH |
880 | u32 gscr_error, sntf; |
881 | int cnt, rc; | |
882 | ||
883 | pmp_tries = ATA_EH_PMP_TRIES; | |
1eca4365 | 884 | ata_for_each_link(link, ap, EDGE) |
3af9a77a TH |
885 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; |
886 | ||
887 | retry: | |
888 | /* PMP attached? */ | |
071f44b1 | 889 | if (!sata_pmp_attached(ap)) { |
a1efdaba TH |
890 | rc = ata_eh_recover(ap, ops->prereset, ops->softreset, |
891 | ops->hardreset, ops->postreset, NULL); | |
3af9a77a | 892 | if (rc) { |
1eca4365 | 893 | ata_for_each_dev(dev, &ap->link, ALL) |
3af9a77a TH |
894 | ata_dev_disable(dev); |
895 | return rc; | |
896 | } | |
897 | ||
898 | if (pmp_dev->class != ATA_DEV_PMP) | |
899 | return 0; | |
900 | ||
901 | /* new PMP online */ | |
1eca4365 | 902 | ata_for_each_link(link, ap, EDGE) |
3af9a77a TH |
903 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; |
904 | ||
905 | /* fall through */ | |
906 | } | |
907 | ||
908 | /* recover pmp */ | |
a1efdaba TH |
909 | rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, |
910 | ops->hardreset, ops->postreset); | |
3af9a77a TH |
911 | if (rc) |
912 | goto pmp_fail; | |
913 | ||
f1bbfb90 TH |
914 | /* PHY event notification can disturb reset and other recovery |
915 | * operations. Turn it off. | |
916 | */ | |
917 | if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { | |
918 | gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; | |
919 | ||
920 | err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, | |
921 | gscr[SATA_PMP_GSCR_FEAT_EN]); | |
922 | if (err_mask) { | |
923 | ata_link_printk(pmp_link, KERN_WARNING, | |
924 | "failed to disable NOTIFY (err_mask=0x%x)\n", | |
925 | err_mask); | |
926 | goto pmp_fail; | |
927 | } | |
928 | } | |
929 | ||
3af9a77a TH |
930 | /* handle disabled links */ |
931 | rc = sata_pmp_eh_handle_disabled_links(ap); | |
932 | if (rc) | |
933 | goto pmp_fail; | |
934 | ||
935 | /* recover links */ | |
a1efdaba TH |
936 | rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, |
937 | ops->pmp_hardreset, ops->pmp_postreset, &link); | |
3af9a77a TH |
938 | if (rc) |
939 | goto link_fail; | |
940 | ||
941 | /* Connection status might have changed while resetting other | |
942 | * links, check SATA_PMP_GSCR_ERROR before returning. | |
943 | */ | |
944 | ||
945 | /* clear SNotification */ | |
946 | rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); | |
947 | if (rc == 0) | |
948 | sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); | |
949 | ||
950 | /* enable notification */ | |
951 | if (pmp_dev->flags & ATA_DFLAG_AN) { | |
f1bbfb90 | 952 | gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; |
3af9a77a | 953 | |
f1bbfb90 TH |
954 | err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, |
955 | gscr[SATA_PMP_GSCR_FEAT_EN]); | |
b06ce3e5 TH |
956 | if (err_mask) { |
957 | ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " | |
958 | "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); | |
959 | rc = -EIO; | |
3af9a77a TH |
960 | goto pmp_fail; |
961 | } | |
962 | } | |
963 | ||
964 | /* check GSCR_ERROR */ | |
b06ce3e5 TH |
965 | err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); |
966 | if (err_mask) { | |
967 | ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " | |
968 | "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); | |
969 | rc = -EIO; | |
3af9a77a TH |
970 | goto pmp_fail; |
971 | } | |
972 | ||
973 | cnt = 0; | |
1eca4365 | 974 | ata_for_each_link(link, ap, EDGE) { |
3af9a77a TH |
975 | if (!(gscr_error & (1 << link->pmp))) |
976 | continue; | |
977 | ||
978 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
979 | ata_ehi_hotplugged(&link->eh_context.i); | |
980 | cnt++; | |
981 | } else { | |
982 | ata_link_printk(link, KERN_WARNING, | |
983 | "PHY status changed but maxed out on retries, " | |
984 | "giving up\n"); | |
985 | ata_link_printk(link, KERN_WARNING, | |
986 | "Manully issue scan to resume this link\n"); | |
987 | } | |
988 | } | |
989 | ||
990 | if (cnt) { | |
991 | ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " | |
992 | "ports, repeating recovery\n"); | |
993 | goto retry; | |
994 | } | |
995 | ||
996 | return 0; | |
997 | ||
998 | link_fail: | |
999 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
cf480626 | 1000 | pmp_ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
1001 | goto retry; |
1002 | } | |
1003 | ||
1004 | /* fall through */ | |
1005 | pmp_fail: | |
1006 | /* Control always ends up here after detaching PMP. Shut up | |
1007 | * and return if we're unloading. | |
1008 | */ | |
1009 | if (ap->pflags & ATA_PFLAG_UNLOADING) | |
1010 | return rc; | |
1011 | ||
071f44b1 | 1012 | if (!sata_pmp_attached(ap)) |
3af9a77a TH |
1013 | goto retry; |
1014 | ||
1015 | if (--pmp_tries) { | |
cf480626 | 1016 | pmp_ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
1017 | goto retry; |
1018 | } | |
1019 | ||
1020 | ata_port_printk(ap, KERN_ERR, | |
1021 | "failed to recover PMP after %d tries, giving up\n", | |
1022 | ATA_EH_PMP_TRIES); | |
1023 | sata_pmp_detach(pmp_dev); | |
1024 | ata_dev_disable(pmp_dev); | |
1025 | ||
1026 | return rc; | |
1027 | } | |
1028 | ||
1029 | /** | |
a1efdaba | 1030 | * sata_pmp_error_handler - do standard error handling for PMP-enabled host |
3af9a77a | 1031 | * @ap: host port to handle error for |
3af9a77a TH |
1032 | * |
1033 | * Perform standard error handling sequence for PMP-enabled host | |
1034 | * @ap. | |
1035 | * | |
1036 | * LOCKING: | |
1037 | * Kernel thread context (may sleep). | |
1038 | */ | |
a1efdaba | 1039 | void sata_pmp_error_handler(struct ata_port *ap) |
3af9a77a TH |
1040 | { |
1041 | ata_eh_autopsy(ap); | |
1042 | ata_eh_report(ap); | |
a1efdaba | 1043 | sata_pmp_eh_recover(ap); |
3af9a77a TH |
1044 | ata_eh_finish(ap); |
1045 | } | |
48515f6c TH |
1046 | |
1047 | EXPORT_SYMBOL_GPL(sata_pmp_port_ops); | |
1048 | EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); | |
1049 | EXPORT_SYMBOL_GPL(sata_pmp_error_handler); |